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Thumbnail Filmstrip of Quantitative Ashless Filter Paper, Fast, 20-25um, 125mm, Cellulose, Nonsterile, 100/Pk Images
Featuring a pure cellulose matrix made from refined pulp and cotton linters with an alpha-cellulose content of virtually 100%, this Grade DFA41 quantitative ashless filter paper delivers ultra-rapid filtration for gravimetric and quantitative analysis. Supplied as 125mm circles in packs of 100, it provides a nominal particle retention of 20 to 25 microns and is acid-washed to reduce inorganic residue to an extremely low level, making it well suited to coarse particles and gelatinous precipitates such as iron and aluminum hydroxides.
Key Cellulose Filter Paper Characteristics
- Constructed from refined pulp and pure cotton linters with an alpha-cellulose content of nearly 100% for high purity and consistent performance.
- Acid-washed during manufacture to achieve an ash content of less than 0.007%, introducing negligible contamination during ignition-based analysis.
- Fast flow rate combined with a 20 to 25 micron nominal particle retention, the fastest in the ashless range.
- Hydrophilic medium that wets readily for efficient aqueous filtration.
- Suitable for Buchner funnels and filtration under pressure.
Key Construction Characteristics
- Material: cellulose (cotton linters / refined pulp).
- Format: 125mm diameter circles.
- Grade DFA41, quantitative ashless, fast flow.
- Nonsterile.
- Supplied 100 pieces per pack.
This paper provides reliable, repeatable separation across the full sheet area, helping to protect the integrity of your samples and the accuracy of your gravimetric results. Its ultra-low ash content ensures that measured mass reflects the captured precipitate rather than residue from the filter itself, supporting confident quantitative determinations in analytical and environmental laboratories.
- Diameter
- 125mm
- Flow Speed
- Fast
- Grade
- DFA41
- Hardened (Yes/ No)
- No
- Material
- Cellulose
- Mesh Format
- Circle
- Nominal Ash Content (%)
- <0.007
- Pack Count
- 100
- Particle Retention
- 20-25 um
- Pore Size (µm)
- 20-25
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 41
- Gravimetric Analysis Collects and ignites coarse precipitates with negligible filter blank contribution for accurate mass measurement.
- Air Pollution Monitoring Serves as a high-flow medium for quantitative air pollution analysis, including paper-tape impregnation for gaseous compound determination.
- Environmental Sample Prep Prepares solid environmental samples such as soils and sludges for metals analysis after nitric acid digestion.
- Gelatinous Precipitate Filtration Rapidly retains coarse and gelatinous precipitates like iron and aluminum hydroxides at high throughput.
- Buchner Funnel Filtration Withstands vacuum and pressure filtration in Buchner funnels for efficient sample clarification.
- Soil and Water Analysis Clarifies aqueous extracts and suspensions in routine quantitative soil and water testing workflows.